Supervisor: doc. RNDr. Andrej Ferko, PhD.

Peter Kán

Comenius University in BratislavaFaculty of Mathematics, Physics and Informatics

with a Parameterized Model Based on a Hierarchical Tree of Facial Features

Introduction

Motivation

Solution• Program structure

• Parameterized model based on a hierarchical tree of facial features

• 3D head reconstruction

• Rendering

Conclusion

Automatic image-based 3D head modeling Peter Kán

Design and implement an application for 3D head model reconstruction from input images

Real-time 3D head model rendering

Model Export

Automatic image-based 3D head modeling Peter Kán

Problem definition

Human head modeling

Automatic image-based 3D head modeling Peter Kán

Problem definition

Automatic image-based 3D head modeling Peter Kán

Human head modeling algorithm

Automation

Automatic image-based 3D head modeling Peter Kán

Automatic image-based 3D head modeling Peter Kán

Automatic image-based 3D head modeling Peter Kán

Parameterized head model creation [Ahlberg 2001]

Parameters detection and parametrized model adjusting

[Mihálik, Kasár, 2007]

[In Kyu Park, Hui Zhang, Vladimir Vezhnevets, 2004]

Texture synthesis and mapping

Automatic image-based 3D head modeling Peter Kán

Haar cascade classifiers with an Extended Set of Haar-like Features

[Paul Viola, Michael Jones]

[Rainer Lienhart,Jochen Maydt]

Skin tone based image segmentation [Prem Kuchi, Prasad Gabbur, P. Subbanna Bhat, Sumam David S.]

+ =

Automatic image-based 3D head modeling Peter Kán

Front face detection

Automatic image-based 3D head modeling Peter Kán

Profile face detection• Skin tone based image segmentation• Median filtration• Head center calculation by linear interpolation• Bounding box calculation• Face contour analysis

Automatic image-based 3D head modeling Peter Kán

Predefined head model (32672 triangles)

Hierarchical structure of facial features

Automatic image-based 3D head modeling Peter Kán

Model adjusting by hierarchical tree of facial features

3D head model reconstruction:

1. Global vertices transformation

2. Local vertices transformation

3. Textures creation

4. Textures mapping

Automatic image-based 3D head modeling Peter Kán

Geometry transformation according to facial features positions detected from input images

Intensity of transformations is defined as vertex weights for each facial feature

Final vertex position calculation by linear interpolation

Automatic image-based 3D head modeling Peter Kán

Real-time

OpengGL

Normal mapping, texture-space diffusion[S. Green, 2004] p

Automatic image-based 3D head modeling Peter Kán

Model parts export:

• geometry, transformations

• efects

[Arnaud, Barnes, 2006]

Texture export

Automatic image-based 3D head modeling Peter Kán

Automatic image-based 3D head modeling Peter Kán

Computer games

Films

Telecommunications

Medicine(Plastic surgery)

Security systems

...

Automatic image-based 3D head modeling Peter Kán

The system for automatic image-based 3D head modeling from 2D images was designed and implemented

The novel technique for 3D head reconstruction with parameterized model based on hierarchical tree of facial features is proposed

New method for detecting head parameters from image with use Haar Cascade Classifiers and skin-tone based segmentation is presented

Collada Engine for rendering 3D models in real time was created

Automatic image-based 3D head modeling Peter Kán

Automatic image-based 3D head modeling Peter Kán

www.peterkan.com